Process of manufacturing paper



Patented Apr. 15, 1924.

UNITED STATES 1,490,523 PATENT OFFICE.

LOGAN G. THOMSON, OF CINCINNATI, OHIO, ASSIGNOR TO THE CHAMPION COATEDPAPER COMPANY, OF HAMILTON, OHIO, A CORPORATION OF OHIO.

PROCESS OF MANUFACTURING PAPER.

No Drawing.

To all whom it may concern:

Be it known that I, LOGAN G. THOMSON, a citizen of the United States, ofCincinnati, in the county of Hamilton and State of Ohio, have invented acertain new and useful Process of Manufacturing Paper, of which thefollowing is a full, clear, and exactdescription.

My invention relates to processes of imparting softness and flexibilityto coated paper by incorporation intdj'the paper of slow drying or slow'solidifying material.

A considerable use has sprung up for coated paper for use in advertisingcirculars which are folded and mailed without protecting boards and arethus subjected to strains, which paper made from wood pulp has not beenfound capable of withstanding.

The requirements, so far as I am advised, have demanded a paper rich inrag content and hence expensive as compared, for example, to sulphitepulp. A sulphite paper is tinny and brittle to a certain extent and thecoating or glaze thereon will crack and the body of the fibre fractureupon the folding of a circular for mailing, as in the above citedinstance.

It is the object of my invention to incorporate into a sulphite or otherwood pulp paper more particularly, but into any form of paper generally,what may be termed a size of a slow drying or slow solidifyingsubstance, so that upon coating the paper, the

non-drying content in the body stock will give flexibility and softnesseven aftercoating a very strong, raw stock containing a large proportionof sulphite pulp. I accomplish my process in details as will be pointedout below and duly claimed.

I make up the paper in any desired way on any machine that is used inthe paper business, the main ingredient. According toone way of makingthe paper, I run it through the machine exactly as in the usual practiceand after it is ready for coating I pass it through a process similar tothe usual coating where I flow onto the paper, in the same way asthe-.usual-coating is imposed, a quantity of some slow solidifyingsubstance, such as glycerine, or other oily substance of like character,so far as solidifying is concerned. According 'to one method I dissolvethe glycerine in water, one part glycerine to four parts water by volumeand the coating ma and a residentof the machine,

using preferably sulphite pulp as Application filed March 14, 1921.Serial No.452,259.

chine and subsequent drying apparatus removes thewater, leaving theproper amount of glycerine.

In controlling the flow and percentage of water used with glycerine andthe operation I have used enough glycerine, for example, as to put intothe paper about fourteen percent, by weight of glycerinc, and I findthat this glycerine will not dry out of the paper due to the dryingaction, above mentioned.

The paper so filled with glycerine I may then store for some days orimmediately pass to a coating machine where the usual coating is addedand such calendering is done as may be desired. The coating may bechinaclay, or such other coating as is desired to give the wished forenamel-like or glossy surface to the paper.

According to another method I may tub size the paper with the glycerinewhile in the process of manufacture, as for example, in theusualFourdrinier machine of the present time, and in this tub sizingprocess take such precaution as may be necessary to prevent stickinessof the paper, due to the glycerine as it passes through the final dryingrolls of the machine, such as, for example, blowing the web with hot airbefore it strikes the next drier.

'My process is regulated so as to insure the positioning within thefibrous structure of the paper of a glycerine-like substance, whichpaper may then be coated without destroying the soft and pliablequality.

Having thus described my invention, what I claim. as new and desire tosecure by'LettersP-atent, is

1. A process of forming paper, which consists in first making a web ofpaper, then incorporating into said web around fourteen per cent ofglycerine by weight, and then coating the paper with an enamel-likecoating adapted to retain the non-drying substance in the paper.

2. A process of forming paper, which consists in first makin a web ofpaper from a large percentage 0 sulphite pulp, then inco crating intosaid web. a quantity of glycerine, and then coating the paper with anenamel-like coating adapted to retain the non-drying substance in thepaper.

3. A process of forming paper, which consists in first making a web ofpaper from a large percentage of sulphite pulp, then ineorporating intosaid Web around fourteen per cent of glycerine by Weight and thencoating the paper With an enamel-like e0ating adapted to retain thenon-drying sub- 5 stance in the paper.

4. A finished paper. comprising mainly sulphite pulp formed into paperin the desired Way, a quantity of a relatively nonsaid paper.

LUGAN G. THOMSQN.

